my tanks already set up, can i add a wet dry?

[new2natives]

i have a 180 setup, but as my fish have grown my filtration is now subpar ....
i got a got a new wet dry, the sump is somewhere around 55g, and the pump is huge (dont know specs)
can adding another 40g of water into the mix hurt my tank in anyway?
or can i just setup everything, add water to the sump, treat it with dechlor, and turn it on?

*obviously i plan to continue using the canister and HOBs that i have on the tank now for a few weeks as well, until the wet dry gets established

 

[TMDragon]

can adding another 40g of water into the mix hurt my tank in anyway?

Nope, your tank will be fine. I added a sump to my 90 a few months after it's been established and running, no problems. Just make sure to rinse out everything really well.

Btw, it would probably be best not to add water until after the sump is hooked up and you let the water in your tank run into the empty sump. That way you will know for sure how much water to add without having it overflow. Not sure if that's what you meant above, just wanted to clear things up. And yeah, make sure to use dechlor.